Take a quantum leap and keep leaping! The MorphoDynamic™ system lets you run over the gnarliest terrain while keeping your foot stable and protected. The slip lasted (that means the shoe fits your foot better) mesh upper is comfortable and extremely breathable.No dead spots, no blisters, no tired feet and no excuses. The La Sportiva Quantum lets you keep your mind on the run and the fun. A lighter version of the Electron. Geared towards people looking for a lighter, more form-ftting upper in a highly cushioned neutral shoe.

"The heart of the La Sportiva Quantum is La Sportiva’s new “MorphoDynamic Technology,” a unique construction where the outsole of the shoe features a layer of soft EVA wrapped in high-traction rubber. This EVA layer is, as the name implies, dynamic, flexing and compressing to move responsively with the terrain beneath your feet..."

I love these shoes so much that I'm buying another pair. I've had them for about 3 years and I use them as an approach shoe to the crag. I also trail run in them from time to time. I do some pretty sketchy scrambling to get the cliff, and these definitely can handle it. They have great traction and I usually just adjust the laces to accomodate the degree of difficulty of the approach. They are NOT waterproof, though, which is unfortunate, especially when approaches involve water and crossing rivers. They do, however, dry out pretty quickly. I use these in all seasons, though they aren't my favorite on really cold days. All in all, I think this is an excellent product and a high value item considering the cost.

The La Sportiva Quantum rocks! All that I read about it was confirmed true last night. There are trails that I avoid in wet weather. Never again. We had a monsoon last night and there wasn't a dry rock to be found. Perfect timing for a test run on techincial up/downhills. The shoe runs about a half size small just like rockcreek.com suggests. I have narrow feet, and these fit me perfectly. The shoelaces are very thin, and stayed tight. The grippy sole gave me confidence on the bluff trail at Lookout and I found myself trying to jump rock to rock just because I was so excited about being able to!!

Josh Wheeler races through the Indian Rock House steps in Prentice Cooper WMA, on his way to a win during the 2009 Rock/Creek StumpJump 50k. Part of the Cumberland Trail, outside Chattanooga, TN. Photo by Andrew Kornylak.